Tamping tool



Jam 27, 1959 J. J. YOCH TAMPING TOOL Filed June 6, 1955 l INVENTOR, JOHN J. YocH BY TM C-&M.

ATTORNEYS.

United States Patent TAMPING TOOL I John J. Yoch, Belleville, 111.

Application June 6, 1955, Serial No. 513,241 Claims. or. 94-49 This invention relates to improvements in a tamping tool and more particularly to improved means in a tool of this type adapted to realize a more efiicient tamping action, and to facilitate manual manipulation.

' It is an important object of this invention to provide a tamping tool that is adapted to deliver a secondary blow to the substance being tamped. Such action and functional result isachieved by the provision of a ham mer carried by a load spring connected to the tool base, the hammer being adapted to move downwardly under its inertia after primary tamping impact of the tool base, whereby to compress the spring and transmit a percussive blow to the tool base, and hence to the tamped sub stance.

' Another important object is realized by the connection and structural arrangement of the hammer and cooperating load spring in that the hammer is urged upwardly under loading of the spring after deliverance of the secondary blow, whereby to provide an automatic lifting action to the base, and hence to the entire tool subsequent to tamping impact of the tool.

= An important objective is achieved by means in a tool of this type which affords a secondary percussive tamping below, and subsequently assists in tool for further actuation.

-Still another important object is realized by the tamp-' ing tool by the provision of means that permits the tool to be manipulated up and down in regular rhythm,

the means assisting in the lifting of the tool, and in delivering a secondary percussive blow upon tamping impact.

Another important object of the invention is to realize a tamping tool that is simple, durable and dependable in construction, easy to assemble and economical tomanufacture.

The foregoing and numerous other objects and advantages of the invention will more clearly appear from the following detailed description of a preferred embodiment. particularly when considered in connection with'the accompanying drawing, in which: I

' Fig. 1 is a side elevational view of the tampingtool; Fig. 2' is an enlarged, fragmentary view, partly in cross section, as seen along line 22 of Fig. 1 with the hammer inits uppermost position; I I

i Fig. 3 is a cross sectionalview of the tamping tool as seen along staggered line 3--3 of Fig. 2, and

Fig. 4 is a fragmentary view, partly in cross section, as seen along staggered line 44 of Fig. 2.

Referring now by characters of reference to the drawing, it is seen that the tamping tool consists of a base generally indicated at 10, which may be of any desired shape or configuration. In the embodiment shown, the base consists of a circular horizontal plate 11 having a lower tamping surface 12. Formed centrally of plate 11 is an integral boss 13 that projects upward- -ly, the boss 13 including an uppermost reduced shoulder lifting the Patented Jan. 27, 1959 14 are of circular cross section as is shown best in.

, carried on base 10. The tubular element 15 has its lower end 16 located about circular boss 13 and seated on plate 11. The tubular element 15 is fixedly secured toplate 11 by weld 17. From Fig. 2 it is seen that circular boss 13 and reduced shoulder portion 14 extend upwardly into the lower end 16 of tubular element 15. The circular periphery of boss 13 closely interfits the internal diameter of tubular element 15, while the circular periphery of reduced shoulder portion 14 is later ally spaced from tubular element 15 for reasons which will become apparent in the subsequent detailed description of the component parts of the tamping tool.

The upper end 20 of tubular element 15 is closed by a closure cap 21 seated'thereon. This closure cap 21 is circular in cross section to conform substantially with the external diameter of tubular element 15, and is secured thereby by welding head 22. The closure cap 21 includes an integral, upstanding circular boss 23 that extends into and closely interfits the lower end 24 of elongate vertical pipe 25, the pipe 25 constituting a handle that may be conveniently utilized for manipulating the tam-ping tool. The handle pipe 25 is fastened to closure cap 21 by a peripheral weld 26. The uppermost end of handle pipe 25 is closed by a cap element 27.

Disposed within tubular element 15 is a movable hammer 30 having a spiral groove 31 formed in the peripheral surface of the lower portion 32 of hammer coils of the upper end of the load spring 34 are located and retained in spiral groove 31 of hammer 30. As is shown in Fig. 3, an end portion 35 of spring 34 is abruptly bent and disposed in transverse recess 33 in order to prevent unintentional and accidental disengagement of spring 34 from hammer 30.

The lower end of load spring 34 is located about reduced shoulder portion 14, as is best shown in Figs. 2 and 4. It is now apparent that reduced shoulder portion 14 is spaced from tubular element 15 to'permit the endmost coilsof spring 34 to be received therebetween. A lowermost end portion 36 of spring 34 (Fig. 4) is abruptly bent and disposed in transverse recess 37 formed in reduced shoulder portion 14 to fasten securely the lower end of load spring 34 to base 10.

In operation, the tamping tool is gripped by handle pipe 25, and is lifted manually to a raised position. Then, the tool is brought downwardly with force so as to bring the base 10 into tamping impact wtih the substance being tamped. Immediately upon impact of base 10 as described above, the hammer 30 continues downwardly in tubular elementlS due to its inertia, and acts to compress load spring 34. The hammer 30 at the end of its downward movement delivers and transmits, through load' spring .34, a secondary percussive blow to tamping base 10. It is seen that this secondary percussive blow is responsive to the inertia of hammer 30.

After hammer 30 is moved to its lowermost position to deliver a secondary blow to base 10, and hence to the substance being tamped, the hammer 30 is urged upwardly under the compressive loading of spring 34. The hammer 30 in moving to its uppermost position in tubular element 15 transmits through load spring 34 a lifting action to base 10, and hence to the tamping tool considered as a whole.- This lifting action enables the person manipuletting the tamping tool'to lift the tool'to a raised position quickly and easily, since a considerable portion of theweight of.the -to.ol is.compensated..for.by suchJiftingaction. The'tool' may then be brought downwardly'to deliver. another. tampingblow duringwbich thevcycle; of

operation .ofiliammer 3i). and load' spring 34' is repeated asdescribed-'a-bove.

' j Theclosure cap =21T is located. above hammer. 3th ants: tance so asto be spacedfrom hammerSl). at all times. .In; other. words, .the.hammer.30- does .notlabut or engage closure cap 21when harnrne rf30; is moved. to. its uppermost positionby load: sp-ringf34l "The; spring 34=may .belselectedTto. be QfTa streng-th to. permibcompre'ssiomunder. hammer inertianpon downweirdstroke.of..'the.tool, and .topermit; expansion .to. urge. hammer .30. upwardly after. de-v livering; the secondary percussive, blow, andyetbeof such te-mace the loading of said spring after said base is brought intostriking engagement with the surface to be compacted, thereafter the hammer moving in a direction under the loading of said spring so that said hammer by its moving inertia transmits through said spring a lifting action to said base and hence to the tool.

4. In a tamping tool, a .tamping base, an elongate, vertical tubular element fastened to said base, a compressible coil spring disposed: int said tubular element, the spring having its lower end fastened to said base, a hammer located in' said tub'ula'r element; the'hammer being free of. direct: attachmenttto said tubular. element, said hammer being fastened to and carried by the upper end ag'strength to. prevent hammer. ISO-from engaging closure.

cap 21.

Although. the invention. has .b'eendescribeduby making detailed referenceto, asingle preferred embodiment, such detailis tobeunderstoodin an instructive, ratherthanin.

any restrictive sense, many variants. being possiblewithin,

the scope of the claims. hereunto. appended.

' Ifclaim as myinvention: I

1. In a tamping tool,,a base, an elongate tubularzeleof said spring, a handle fixed o-n saidtubular element for raising and lowering said tool, the hammer being movable downwardly against the loading of said spring after said base is brought into striking engagement with the surface to, be. compacted, said hammer transmitting, throughr'said spring a secondaryadditionalrblow to 'said-.base;;said:ham+ mer beingamovablehpwardly under; the; loading of; said spring after transmittal of saidtsecondaryblow:soeas-to effect, throughzsaidspring a liftingaction tosaid-base. by

itsupwardly moving inertia, whereby to facilitate lifting ment' fixedly secured to said base, a compressiblev coilv spring disposedin said tubular element, ahandle fixedly, secured 1 to said tubular e1ement.adapted for raising-and lowering said. tool, a. hammerlocatedinsaid. tubular. element. for reciprocal movement .in a verticaldirection, the. hammer. being free of direct attachment.to;said.tubu1an element; the coil spring having one .end. connectedto said hammer, and'having the opposite end,.anchored.totsaid base, the hammer moving upwardlyunder'springloading,

so that said hammer transmits through said springa lifting oflsaidttampingioolz In atampingtool,,.a tampingbase, an elongate, verti cal tubular element located above said base,v said tubular. elementhavinga lower endfastenedsecurely to saidbase;

said-base having a: reducedshoulder portion extending;

intosaidlower end of said tubular element,. said shoulder: portion ,being, spaced-laterally from said tubularelemenn. said tubular element having an open upper end, a closure, elementfixedly secured to saidupper end;-of:the-tubularv element, athandle. fixedly secured to: said closure,- the handleabeingadaptedflfon raisingand lowering'saidntoolia;

action to said baseand toolin responseto hammer inertia whereby to facilitate manual lifting ,of. said tool;

2. 1h atampingtool, a. lower. base, a tubularelement; fastenedto said base, a handle. fastened to said tubular. element,.a compressible coil spring disposed in saidtubu-z. lar element, a hammer. locatedin said tubular element. above said coil spring, said tubular elementcc-nstraining said'h'ammer to reciprocal movement in a verticaldirection, the hammer being freeof directattachment to :said.

tubular element, the spring having its upper end-connected to saidhammer, and having its oppositelower end, operativeiy connected to said base, the. hammer being movable downwardly against theloading of. said spring: after said base isbrought into striking,engagementwith,

the surface to be compacted, the hammer then being move able upwardly under spring loadingso thatsaid hammer.

transmits through said'spring a lifting action to saidabase and tool'in response to its upwardlyrnoving ine'rtia..

3. In a tamping tool, a base, an elongate tubular element fixedly secured to said. base, a compressible coil springdisposed in said tubular element, av handle fixedly.

securedto said tubular element, a hammer; locatedfin, said. tubular element; the hammer being free of"direct..attacl1'-. ment to' said tubular element, the coil spring having-one, end operatively connected to said base, the hammer being connected to'and carn'ed'by'the opposite end 'ofsaidiicoilf spring, the-hammer being movable'in a'dir ection against compressible. coil 1 spring-disposed in said tubular,- element; said; spring having, a lower end arranged about and 1 fas'-- tened-toisaidireducedz-shoulderportion, ahammer located;

. in said tubular element; the-hammer beingfree: of'direct! References Cited: inthe fileof-thisupatent'z v I UNITED STATES' PATENTS. 1,107,976

2,1.60,462'. Schieferstein: c a. May 30,1939 2,646,729 *Godenir July 28,1953

POREIGN'PATENTS." 

